#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main(void)
{
	int aa[4][4] = { {1,2,3,4},{5,6,7,8},{3,9,10,2},{4,2,9,6} };
	int i, s = 0;
	for (i = 0; i < 4; i++)
		s += aa[i][i];
	printf("%d\n",s);
	int a= 5, b= -5;
	printf("%d,%d", a % (-4), b % (-4));
}